The screen animation jitters when opening the Achievements screen with no internet connection

The screen animation jitters when opening the Achievements screen with no internet connection.

How to reproduce:

1. Turn off your internet
2. Load Minecraft
3. Go to the Achievements screen with screen animations turned on
4. Observe the screen animation jittering

Observed results:

The screen animation jitters when opening the Achievements screen.

Expected results:

The screen animation should not jitter when opening the Achievements screen.